Genus of gastropods
Topaginella is a genus of minute fossil sea snails , marine gastropod mollusks or micromollusks in the family Cystiscidae . Like all of the related genera, this genus is sometimes still classified in the family Marginellidae .
This genus is extinct.
Shell description
Shell minute, pyriform, strongly narrowed anteriorly; spire low; lip thickened, strongly denticulate; external varix probably absent (needs to be confirmed); distinct axial costae present; siphonal notch absent; columella multiplicate, with combined total of usually 8 plications plus parietal lirae .
Type species
The type species of the genus Topaginella is
Marginella octoplicata Tenison Woods , 1877 †; OD (M)
Remarks: The type species seems to be unique (a monotypic genus). The multiplicate columella and lack of a siphonal notch place it near Cystiscus , but the pyriform shape, exserted spire , denticulate lip, and fine axial costae render it distinct.
Fossil record
This genus is known from the Miocene of Australia .
References